feat(voice): add screen share subscription debug helper (#2432)

fluxer_app/src/features/platform/utils/FluxerDebugGlobal.ts

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+type FluxerDebugObject = NonNullable<Window['__FLUXER_DEBUG__']>;
+
+export function getFluxerDebugObject(): FluxerDebugObject | null {
+	if (typeof window === 'undefined') {
+		return null;
+	}
+	const existing = window.__FLUXER_DEBUG__;
+	if (existing === undefined || existing === null) {
+		const created: FluxerDebugObject = {};
+		window.__FLUXER_DEBUG__ = created;
+		return created;
+	}
+	if (typeof existing !== 'object' || Array.isArray(existing)) {
+		return null;
+	}
+	return existing;
+}